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   "metadata": {},
   "source": [
    "# Week 184 The Weekly Challenge\n",
    "# Task 2: Split Array\n",
    "\n",
    "You are given list of strings containing 0-9 and a-z separated by space only.\n",
    "\n",
    "Write a script to split the data into two arrays, one for integers and one for alphabets only.\n",
    "Example 1\n",
    "```\n",
    "Input: @list = ( 'a 1 2 b 0', '3 c 4 d')\n",
    "Output: [[1,2,0], [3,4]] and [['a','b'], ['c','d']]\n",
    "```\n",
    "Example 2\n",
    "```\n",
    "Input: @list = ( '1 2', 'p q r', 's 3', '4 5 t')\n",
    "Output: [[1,2], [3], [4,5]] and [['p','q','r'], ['s'], ['t']]\n",
    "```"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "id": "34ae5529",
   "metadata": {},
   "outputs": [],
   "source": [
    "input1 = ('a 1 2 b 0', '3 c 4 d')\n",
    "input2 = ('1 2', 'p q r', 's 3', '4 5 t')"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "95af3e0d",
   "metadata": {},
   "source": [
    "Start by working out how to take one string and split the data into two arrays."
   ]
  },
  {
   "cell_type": "markdown",
   "id": "315587cc",
   "metadata": {},
   "source": [
    "Split the string on whitespace:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "id": "35dfad2b",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "['a', '1', '2', 'b', '0']"
      ]
     },
     "execution_count": 2,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "input1[0].split(\" \")"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "7e670f24",
   "metadata": {},
   "source": [
    "Digits need to be cast to int type.\n",
    "Function returns a tuple containing 2 arrays, first of integers then of letters. Empty arrays may be returned."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "id": "b5021170",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "([1, 2, 0], ['a', 'b'])"
      ]
     },
     "execution_count": 3,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "def separate_alpha_num ( alpha_num_string ):\n",
    "    integers, letters = [], []\n",
    "    for x in alpha_num_string.split(\" \"):\n",
    "        letters.append(x) if x.isalpha() else integers.append(int(x)) \n",
    "    return integers, letters\n",
    "\n",
    "separate_alpha_num(input1[0])"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "9ad2ac4e",
   "metadata": {},
   "source": [
    "Next create a function to handle the list of strings.  It will return 2 arrays of arrays, first of integers then letters."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "id": "aac5d69f",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[[1, 2, 0], [3, 4]]  and  [['a', 'b'], ['c', 'd']]\n"
     ]
    }
   ],
   "source": [
    "def separate_alpha_num_from_strings(los):\n",
    "    lo_integers, lo_letters = [], []\n",
    "    for s in los:\n",
    "        integers, letters = separate_alpha_num(s)\n",
    "        if integers: lo_integers.append(integers)  # Only add arrays if not empty\n",
    "        if letters: lo_letters.append(letters)\n",
    "    return lo_integers, lo_letters\n",
    "\n",
    "integers, letters = separate_alpha_num_from_strings(input1)\n",
    "print(integers, \" and \", letters)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "id": "97771b02",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[[1, 2], [3], [4, 5]]  and  [['p', 'q', 'r'], ['s'], ['t']]\n"
     ]
    }
   ],
   "source": [
    "integers, letters = separate_alpha_num_from_strings(input2)\n",
    "print(integers, \" and \", letters)"
   ]
  }
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